Error on drawing Listbox

[Nokia_Archive]

I create an Instance of CCknVerticalTextAndIconListBox and populate it with text as given in the sample with the SDK.

I have populated the modeliconarray with null as in the sample to turn the icons off. When I populate just on item it shows correctly. When I populate more than one items I get an error on iIconList->DrawNow().

Any reason why this error?

Also in the sample it says to set the column gap use View()->SetColumnGap(2). But the CListBoxView does not have a method SetColumnGap.

Any suggestions as to what could be wrong?

The code is as follows -

void CTestAppAppView::ConstructL(const TRect& aRect)
{
CreateWindowL();
SetRect(aRect);
ConstructIconListBoxL();
ActivateL();

// here I get an error
iIconList->DrawNow();

iIconList->PrepareForFocusGainL();
iIconList->SetFocus(ETrue);
iIconList->View()->SelectItemL(0);
}

void CTestAppAppView::ConstructIconListBoxL()
{
iIconList = new(ELeave) CCknVerticalTextAndIconListBox;
iIconList->ConstructL(this,ELbmOwnsItemArray,NULL,NULL);
CTextAndIconListBoxModel* model_ptr = (CTextAndIconListBoxModel*) iIconList->Model();
//Get the text array from the list box model.
MDesCArray* temptextArray = model_ptr->ItemTextArray();
//Cast to CDesCArray*.
CDesCArray* modelTextArray = (CDesCArray*) temptextArray;
_LIT(pTemp,"abc");
modelTextArray->AppendL(pTemp);
_LIT(pTemp2,"xyz");
modelTextArray->AppendL(pTemp2);

//Get pointer to the icon array.
CArrayPtr<CGulIcon>* modelIconArray=model_ptr->IconArray();

modelIconArray->ResetAndDestroy();
modelIconArray->AppendL(NULL);

iIconList->SetExtent(TPoint(20, 30), TSize(400, 80));

//Create scroll bar frame.
iIconList->CreateScrollBarFrameL(ETrue);
//Set the HORIZONTAL scroll bar to be ON, and the VERTICAL one to be off.
iIconList->ScrollBarFrame()->SetScrollBarVisibilityL(CEikScrollBarFrame::EOn, CEikScrollBarFrame::EOff);
//Set the border type. This defaults to ENone.
iIconList->SetBorder(TGulBorder::EThickDeepRaisedWithOutline);

//Set the gap between items to 1.
iIconList->View()->ItemDrawer()->SetVerticalInterItemGap(10);
iIconList->SetItemHeightL(50);

iIconList->ActivateL();
}

Brijesh

Posted by brijesh Gajaria, brijesh@itfinity.com
on January 04, 2002 at 09:21

[Nokia_Archive]

Posted by Forum_Nokia Developer_Support, communicator.developer@nokia.com
on January 04, 2002 at 13:30

The icon array contains the icon for every item in the list box. If your listbox has 2 items you need to append 2 NULL's:

//Get pointer to the icon array.
CArrayPtr<CGulIcon>* modelIconArray=model_ptr->IconArray();

modelIconArray->ResetAndDestroy();

modelIconArray->AppendL(NULL);
modelIconArray->AppendL(NULL);

To set the column gap you will need to cast the view returned by your listbox to CSnakingListBoxViewWithGapsAndBrush and then call SetColumnGap, see header file CKNLBV.H

Regards,
FN Developer Support